diff --git a/etrago/cluster/spatial.py b/etrago/cluster/spatial.py
index e61c915e..813c326e 100755
--- a/etrago/cluster/spatial.py
+++ b/etrago/cluster/spatial.py
@@ -110,7 +110,11 @@ def sum_with_inf(x):
 
 
 def strategies_buses():
-    return {"geom": nan_links, "country": "first", "scn_name": "first",}
+    return {
+        "geom": nan_links,
+        "country": "first",
+        "scn_name": "first",
+    }
 
 
 def strategies_lines():
diff --git a/etrago/tools/io.py b/etrago/tools/io.py
index 7f1153e5..579d0fad 100644
--- a/etrago/tools/io.py
+++ b/etrago/tools/io.py
@@ -832,7 +832,6 @@ def extension(self, **kwargs):
             self.network = scenario.build_network(self.network)
 
 
-
 def decommissioning(self, **kwargs):
     """
     Function that removes components in a decommissioning-scenario from